OK - I found the spec for this TV (http://www.mitsubishi-tv.com/img/262190) and it definitely has 1080p inputs, so that clears that issue for me. I've had another issue with this TV (in another thread) but it looks like that has been cleared up, so I will go ahead and have this one delivered to me.
I was just at a store looking at a Mitsubishi WD-57731 and was told that it definitely has 1080p inputs - can anyone confirm that? I might just buy that one...